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在分析经典的三通道SAR(Synthetic Aperture Radar)地面动目标指示(GM-TI,Ground Moving Target Indication)方法原理的基础上,提出一种较全面三通道SAR/GMTI性能评价方法.该方法同时考虑了载机存在速度误差、通道不匹配、杂波内部运动和系统噪声等主要误差因素,并分析了各种因素对系统性能的影响.经典的三通道SAR/GMTI方法存在的缺点是不能同时提高最大不模糊可检测速度、最小可检测速度和盲速指标的性能以满足系统设计的要求.给出了一种新的天线布置方案和动目标检测方法,改进的检测方法在不增加通道数的前提下,较好地解决了该问题,具有很好的实用性.最后通过计算机仿真验证了新方法的可行性.
Based on the analysis of the principle of the classic three-channel SAR (Synthetic Aperture Radar) Ground Moving Target Indication (GM-TI), a more comprehensive three-channel SAR / GMTI performance evaluation method is proposed, The main error factors such as speed error, channel mismatch, internal clutter and system noise are analyzed, and the influences of various factors on the system performance are analyzed.The disadvantages of classical three-channel SAR / GMTI method can not be improved at the same time The maximum unambiguous detectable speed, the minimum detectable speed and the performance of blind speed index to meet the requirements of system design.A new antenna arrangement scheme and moving target detection method are given.An improved detection method without increasing the number of channels Under the premise, this problem is solved well and has good practicability.Finally, the feasibility of the new method is verified by computer simulation.